toxssin is an open-source penetration testing tool that automates the process of exploiting Cross-Site Scripting (XSS) vulnerabilities. It consists of an https server that works as an interpreter for the traffic generated by the malicious JavaScript payload that powers this tool (toxin.js).
This project started as (and still is) a research-based creative endeavor to explore the exploitability depth that an XSS vulnerability may introduce by using vanilla JavaScript, trusted certificates and cheap tricks.
Disclaimer: The project is quite fresh and has not been widely tested.
Find screenshots here.
By default, toxssin intercepts:
Most importantly, toxssin:
git clone https://github.com/t3l3machus/toxssin
cd ./toxssin
pip3 install -r requirements.txt
To start toxssin.py, you will need to supply ssl certificate and private key files.
If you don't own a domain with a trusted certificate, you can issue and use self-signed certificates with the following command (although this won't take you far):
openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365
It is strongly recommended to run toxssin with a trusted certificate (see How to get a Valid Certificate in this document). That said, you can start the toxssin server like this:
# python3 toxssin.py -u https://your.domain.com -c /your/certificate.pem -k /your/privkey.pem
Visit the project's wiki for additional information.
In my experience, there are 4 major obstacles when it comes to Cross-Site Scripting attacks attempting to include external JS scripts:
Content-Security-Policy
header with the script-src
set to specific domain(s) only will block scripts with cross-domain src from loading. Toxssin relies on the eval()
function to deliver its poison, so, if the website has a CSP and the unsafe-eval
source expression is not specified in the script-src
directive, the attack will most likely fail (i'm working on a second poison delivery method to work around this).Note: The "Mixed Content" error can of course occur when the target website is hosted via http and the JavaScript payload via https. This limits the scope of toxssin to https only webistes, as (by default) toxssin is started with ssl only.
First, you need to own a domain name. The fastest and most economic way to get one (in my knowledge) is via a cheap domain registrar service (e.g. https://www.namecheap.com/). Search for a random string domain name (e.g. "fvcm98duf") and check the less popular TLDs, like .xyz, as they will probably cost around 3$ per year.
After you purchase a domain name, you can use certbot (Let's Encrypt) to get a trusted certificate in 5 minutes or less:
Tip: Don't install and run certbot on your own, you might get unexpected errors. Stick with the instructions.
2022-06-19
- Added the exec prompt command (you can now execute custom JS scripts against a session).2022-06-23
- I added two simple, dirty scripts as templates for testing the exec prompt command. I also fixed the cmd prompt's backward history access and made some improvements.
The idea is to make it sharper, more reliable and expand its capabilities. Currently, i'm working on improving file captures.